1. 邮寄：mailing machine 邮件收发机 | mailing 邮寄 | maillot 女游泳衣

2. 邮政：求助 Asking For Help ??????????????? | 邮政 Mailing ?????? | 电话 Telephone ????????

3. 投递：mailing 农场租金 | mailing 投递 | mailing 投递

4. 邮件：mailbox:::邮件箱 | mailing:::邮件 | main:::主

1. 邮寄;投寄
Mailing is the activity of sending things to people through the postal service.

e.g. The newsletter was printed towards the end of June in readiness for mailing...
快到6月底的时候，时事通讯印刷完毕准备投寄。
e.g. The owners of the store have stepped up customer mailings.
店主们加大了对顾客的邮寄宣传力度。

2. 邮件
A mailing is something that is sent to people through the postal service.

e.g. The seniors organizations sent out mailings to their constituencies.
老年人组织向各自的会员寄送了邮件。

noun

1. the transmission of a letter

e.g. the postmark indicates the time of mailing

Synonym: posting

2. mail sent by a sender at one time

e.g. the candidate sent out three large mailings